Determination of impedance parameters for mild steel/HCl interface using integration method

Impedance measurements for the interface between mild steel/hydrochloric acid as a function of cysteine (Cys) concentration were carried out for a wide enough frequency range. The validity of the impedance data was checked using the Kramers-Kronig (K-K) transforms. Despite the deviations at low frequencies for both transforms, imaginary-to-real and real-to-imaginary, a successful fit for the high frequencies was reached. The impedance parameters were determined from imaginary component of experimental impedance vs. log. f diagrams using integration method and from complex plane plots fitting experimental results to an appropriate equivalent circuit. A compromise of parameters from two different plot methods was seen. © 2011 Elsevier Ltd.EF2010BAP5The authors would like to thank the Cukurova University Research Fund for the support (EF2010BAP5)

Evaluation of corrosion inhibition of mild steel in 0.1M HCl by 4-amino-3-hydroxynaphthalene-1-sulphonic acid

The corrosion behaviour of 4-amino-3-hydroxynaphthalene-1-sulphonic acid (4A3H1S) in 0.1M HCl on mild steel (MS) was measured by electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic measurements at various concentrations. The surface morphology of the MS was examined by scanning electron microscopy (SEM) both in the absence of an inhibitor and in the presence of a 10mM 4A3H1S-containing corrosive medium. The inhibition mechanism was determined by the potential of the zero charge (Epzc) measurement at the solution-metal interface. The adsorption of 4A3H1S on the surface of MS obeyed the isotherm of Langmuir adsorption. © 2014 Elsevier Ltd

Insights into surface-adsorbate interactions in corrosion inhibition processes at the molecular level

2-((3-Methylpyridine-2-imino)methyl)phenol (MPIMP) was investigated as a potential corrosion inhibitor for mild steel in 0.5. M HCl solution using impedance spectroscopy (IS). Changes in impedance parameters indicated that adsorption of MPIMP occurred on the mild steel surface. Three stable adsorption configurations for MPIMP on the Fe(1. 1. 0) surface were identified as a result of geometry optimization starting from several adsorption geometries using density functional theory (DFT). Involvement of the delocalized ?-electrons of the aromatic rings in the interaction provides extra stabilization to the flat adsorption configurations. © 2013 Elsevier Ltd.Muzaffer Özcan and İlyas Dehri would like to thank the Çukurova University Research Fund for the financial support. Daniele Toffoli and Hande Üstünel wish to thank ULAKBIM (TR-GRID) for computational resources